<template>
  <div style="line-height: 50px;min-height: 50px;float: left;">
    <el-breadcrumb class="app-breadcrumb" separator=">">
      <transition-group name="breadcrumb" class="bread-box">
        <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
          <span
            v-if="
              item.redirect === 'noRedirect' || index == levelList.length - 1
            "
            class="no-redirect"
            >{{ item.meta.title }}</span
          >
          <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
        </el-breadcrumb-item>
      </transition-group>
    </el-breadcrumb>
  </div>
</template>

<script>
import pathToRegexp from "path-to-regexp";
export default {
  data() {
    return {
      levelList: null
    };
  },
  watch: {
    $route(route) {
      // if you go to the redirect page, do not update the breadcrumbs
      if (route.path.startsWith("/redirect/")) {
        return;
      }
      this.getBreadcrumb();
    }
  },
  created() {
    this.getBreadcrumb();
  },
  methods: {
    getBreadcrumb() {
      // only show routes with meta.title
      let matched = this.$route.matched.filter(
        item => item.meta && item.meta.title
      );
      const first = matched[0];
      // if (!this.isDashboard(first)) {
      //   matched = [{ path: '/dashboard', meta: { title: 'Dashboard' }}].concat(matched)
      // }
      this.levelList = matched.filter(
        item => item.meta && item.meta.title && item.meta.breadcrumb !== false
      );
    },
    isDashboard(route) {
      const name = route && route.name;
      if (!name) {
        return false;
      }
      return (
        name.trim().toLocaleLowerCase() === "Dashboard".toLocaleLowerCase()
      );
    },
    pathCompile(path) {
      // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
      const { params } = this.$route;
      var toPath = pathToRegexp.compile(path);
      return toPath(params);
    },
    handleLink(item) {
      const { redirect, path } = item;
      if (redirect) {
        this.$router.push(redirect);
        return;
      }
      this.$router.push(this.pathCompile(path));
    }
  }
};
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  // display: inline-block;
  font-size: 13px;
  line-height: 16px;
  height: 16px;
  // background: #fff;
  padding-top: 18px;
  color: #333;
  // margin-bottom: 15px;
  &::before {
    content: "当前位置：";
    border-left: solid 3px #2a6799;
    float: left;
    height: 16px;
    line-height: 16px;
    //  margin: 8px 0 0 20px;
    padding-left: 15px;
  }

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>
